Lathe



Dec. 11 1923. 1,477,102

N. F. sRAsAccHlo' LATHE Filed March 30. 1922 INVENTOR 1K iLBrasacc/ab.

ATTORNEYS Patented Dec. 11, 1923.

NICK FRANGK BRASACGHIO, 0F TAMPA, FLORIDA.

LATHE.

Application filed March 30, 1922. Serial No. 548,113;

To all whom it nwg concern:

Be it known that I, N101; F. BRASAGCHIO, a. citizen of the United States, and resident of Tampa, in the county of Hillsborough and the State. of Florida, have invented a new and useful Improvement in Lathes, of which the following is a. specification.

This invention relates to lath-es especially adapted for use in refacing the valves of internal combustion and other engines.

Briefly stated, an important object is to provide a portable la the embodying a tubular shaft which receives thestem of the valve and which is rotated at aihigh speed for presenting the head of the valve to the refacinptool, the said tubular shaft form-i ing ameans for properly holding and center? ing the valve notwithstanding-any bends or irregularities which might exist in the valve stem. I A further object is to provide a valve refacing tool having simple means whereby the cutter or file may be quickly and conveniently adjusted to the desired angle.

A further object is to provide a lathe of the character specified having simple means whereby to center the head of the valve and to rotate the same at a high speed so that when the refacing tool is gradually fed to the head of the valve an accurate face will be provided, the high speed attained by the head of the valye being possible by the fact that the sleeve which supports the valve is freely rotatable in well lubricated bearings.

A further object is to provide a valve refacing tool or lathe which is extremely durable in use, simple to operate and cheap to manufacture.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawing forming a part of this application and in which like numerals are employed to designate like parts throughout the same.

Figure l is a perspective of the improved lath Figure 2 is a plan view thereof.

Figure 3 is a. group perspective of one of the shaft supporting bearings.

In the drawing wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 5 designates an elongated base having its ends provided with depending frames 'or legs 6 having attaching lugs 7 secured to a workbench 8 by means of fastening bolts 9. Itwill be observed that the base 5 is arranged a suiticientdistance above the workbench 8 to afford ready recess to the several adjusting devices located beneath the base.

As illustrated in Figure 11 are provided with threaded stems 14: having engagement with wing nuts 15 by means of which the bearings 12' may be securely and positively held in an adjusted position.

One end of the tubular shaft 13 is pro-- 1, the base 5 is provided with a longitudinally extending vided with a pulley 16 about WilllCh a; belt 17 or other power transmitting device is trained. The belt 17 is connectedto a suitable source of power and serves to rotate the tubular shaft at a very high speed so that the valve carried thereby will also be.

rotated at a. very high speed.

The stem of the valve is designated by the numeral 19 and is extended into the tubular shaft 13 and thereto by means of a chuck 20. The chuck 20 may be of any desired construction and has its surface roughened so that it may be conveniently turned when it is desired to tween the shaft and the" stem.

The head 22 of the valve is properly cen tered by means of the centering screw 23 having a hand crank 24-by means of which it may be manually rotated. The forward end of the centering screw is tapered to a point and is extended into the centrally arranged recess in the head of the valve. When the centering screw has beenproperly positioned it may be locked by means of :1 jam nut 25 threaded thereon and adapted for abutting the standard 28.

The standard 28 supports the. centering screw and is provided with a squared shank extended through the slot 10 and having a threaded stem 30 with which a wing nut 31 is engaged. It will be seen that the standard 28 may be securely held in an adjusted position by means. of the wing nut 31. In use, the standard 28 and the bearing members 12 may be adjusted longitudinally of the base for accommodating valves of different lengths.

When adjusting the centering screw 23 it is advanced until the annular shoulder 34 on may be securely connected the shaft 18 contacts with one of the bearlugs 12 and the jam nut is then tightened. \Vith the valve thus locked to the shaft 1-3 it is permitted to rotate with the shaft but is securely held against endwise movement so that when the power is applied an accurate face will be formed on the head of the valve.

A refacing tool or cutter 4:0 is carried by a standard 421 having a set screw. 42 which acts to hold the cutter at the desired angle, and in engagement with the face of the head 22. By loosening the set screw the cutter 40 maybe adjusted, or if desired the cutter may be quickly removed and a new one substituted.

The standard ell is formed with a squared shank i5 slidab'le tnrough a diagonal slot 46 in a lateral projection 457 of the base. The shank i5 is similar in construction to the shank l1 and is securely held in a set position by means of an adjusting nut of any desired type. In the use of the device the nut which holds the standard in position is not tight enough to prevent the feed screw 50 from advancing the cutter into engage ment with the work. The feed screw 5'0 is extended out tl'irough one side of the machine and is threaded through a standard 60 adjustable diagonally of the base The standard 60 is also provided with a squared shank adjustable in the diagonal slot 46 of the lateral projection 47.

In operation, a valve stem is inserted into the sleeve or tubular shaft 13 and the centering screw 28 is subsequently advanced and locked in position so that the valve is held againstendwise movement. The power is now applied to rotate the tubular shaft 13 whereby the head 22 is also rotated. The cutter is now gradually advanced into engagement with the face of the valve so that a new and accurate face is formed. As previously stated any irregularities or slight bends which might be present in the stem of the valve do not in any way interfere with the accurate facing of the valve as the stem is inserted into the tubular shaft which is sup-ported for rotation by the bearing members 12.

A very high speed is possible because the tubular shaft 13 and the bearings 12 are well lubricated by oil supplied through oil holes 67, none of which is possible without the employment of the tubular shaft.

A lathe constructed in accordance with this invention is extremely simple to oper- 1 ate; durable in use and cheap to manufacture, and further, the refacing operation may be expeditiously performed.

1 claim l. A valve refacing tool comprising a base having a lateral projection, the base being provided with a longitudinal slot, and the lateral projection being provided with a diagonal. slot, a standard having squared shank, slidable through said. longitudinal. slot and adjustable therein a centering screw carried by said standard, a pairof bearings having square shanlrs adjustable in said longitudinal slot means carried by said bearings for rotatably supporting a valve, a second standard having squared shank adjustable in said diagonal slot a cutter car ried by said second standard a bracket having a squared shank adjustable in said diagonal slot, through said bracket and having engagement with said second standard.

2. A valve tool comprising a base having a longitudinal slot, separate bearings having shanks adjustable in said slot, a valve receiving sleeve rotatable in said bearings and having means to grip a valve stem, a centering screwhavin a standard provided with a shank adjustaldle in said slot, said base beingprovided with a diagonal slot, a cutter having a standard provided with a shank adjustable in said diagonal "slot a bracket having a square shank adjustable in said diagonal slot, and means whereby said shaft mav be rotate d V NICK FRANCK BRASACCHIQ and a feed screw threaded 

